<template>
  <!--  Element-ui代码开始-->
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/iconfont.png" alt=""/>
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区-->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse = 'isCollapse'
          :collapse-transition='false'
          :router = 'true'
          :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id+''" v-for = 'item in menulist' :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconObj[item.id]"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/'+subItem.path" v-for = 'subItem in item.children' :key="subItem.id"
                          @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧内容主体-->
      <el-main>
      <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
  <!--  Element-ui代码结束-->
</template>

<script>
  export default {
    // 定义组件私有数据
    data(){
      return {
        // 左侧菜单数据
        menulist:[],
        iconObj:{
          '125':'iconfont icon-user',
          '103':'iconfont icon-tijikongjian',
          '101':'iconfont icon-shangpin',
          '102':'iconfont icon-danju',
          '145':'iconfont icon-baobiao'
        },
        // 是否折叠
        isCollapse:false,
        // 被激活的链接地址
        activePath:''
      }
    },
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        // 清除session
        window.sessionStorage.clear();
        this.$router.push('/login');
      },
      // 获取所有的菜单
      async getMenuList() {
        const {data:res} = await this.$http.get('menus')
        if (200!==res.meta.status){
          return this.$message.error(res.meta.msg)
        } else{
          this.menulist = res.data;
        }
      },
      // 点击按钮，切换菜单的折叠与展开
      toggleCollapse(){
        this.isCollapse = !this.isCollapse;

      },
      // 保存链接的激活状态
      saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath);
        this.activePath = activePath;
      }
    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }

  .el-header {
    background-color: #373D41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    > div {
      display: flex;
      align-items: center;

      span {
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }

  }

  .el-main {
    background-color: #EAEDF1;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }

</style>
